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Day of Defeat: Source is the newest version of Day of Defeat, the World War II online shooter that was originally developed as a free mod for Half-Life. Built on the Source engine and distributed through Steam, Day of Defeat: Source offers team-based game play with scenarios inspired by historical World War II battles. It was the first Source game to incorporate high dynamic range rendering (HDR), predating the official HDR technical demo, Half-Life 2: Lost Coast.